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A prospective randomized clinical trial of one bis-GMA-based and two ormocer-based composite restorative systems in class
II cavities: five-year results

Journal

Journal of Dentistry

Volume | Issue number

37 | 3

Pages (from-to)

198-203

Document type

Article

Faculty

Faculty of Dentistry (ACTA)

Abstract

Objectives: Ormocer composites, consisting of a silicon-based polymer, have been developed recently as a tooth-colored restorative
material. The purpose of this prospective randomized clinical trial was to evaluate the performance of two small-particle
hybrid ormocer-based restorative systems (AD, Admira/Admira Bond, VOCO; DE, Definite/Etch & Prime 3.0, Dentsply) and one
small-particle hybrid bis-GMA-based composite restorative system (TC, Tetric-Ceram/Syntac, Ivoclar-Vivadent) in class II cavities.Methods:
From 128 occlusal-proximal restorations (44 AD, 43 DE and 41 TC) placed in 32 adult patients, eventually 77 (22 AD, 29 DE
and 26 TC) remained available for evaluation after 5 years. Their clinical performance was scored according to the USPHS criteria
and evaluation of bite-wing radiographs.Results: After 5 years, eight AD, six DE and seven TC restorations had failed
(p = 0.10, log-rank test). The main reason was fracture or marginal gap formation, while secondary caries accounted for four
failures. In all restorations the quality of surface, margins and contact point decreased significantly compared to baseline.
DE had a significant poorer color match (p < 0.01). Statistical evaluation using the KW test showed that failures were
concentrated on specific patients.Conclusions: In a group of class II restorations, there was no significant difference
in failures after 5 years between ormocer-based and bis-GMA-based restorative systems.

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